Which is Best social media for promotion..?

Both are good but facebook has more no of user that is why facebook is better for social media promotion but it may also depend on the product that you are selling.
 
It depends on your product and target audience :)

But I heard, that Facebook generate the biggest amount of traffic to the blogs, if compare with other social media.

So, it's up to you. If I were you, I'd promote my product on different social media channels to find out which works better for my product.
 
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